Re: [Crash-utility] [PATCH] arm64 : Update the section_size_bits for latest kernel

Hi Lianbo, Ankur, I've updated, does this work well? -- From: Kazuhito Hagio <k-hagio-ab(a)nec.com&gt; Date: Thu, 11 Nov 2021 15:20:52 +0900 Subject: [PATCH] arm64: Update SECTION_SIZE_BITS for kernels >= 5.12 Update the default SECTION_SIZE_BITS value for arm64 Linux 5.12 and later kernels that contain kernel commit f0b13ee23241 ("arm64/sparsemem: reduce SECTION_SIZE_BITS"). Reported-by: Ankur Bansal <er.ankurbansal(a)gmail.com&gt; Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com&gt; --- arm64.c | 8 +++++++- defs.h | 4 +++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arm64.c b/arm64.c index 3dcbcc642fda..94681d1a37db 100644 --- a/arm64.c +++ b/arm64.c @@ -1116,7 +1116,13 @@ arm64_get_section_size_bits(void) int ret; char *string; - machdep->section_size_bits = _SECTION_SIZE_BITS; + if (THIS_KERNEL_VERSION >= LINUX(5,12,0)) { + if (machdep->pagesize == 65536) + machdep->section_size_bits = _SECTION_SIZE_BITS_5_12_64K; + else + machdep->section_size_bits = _SECTION_SIZE_BITS_5_12; + } else + machdep->section_size_bits = _SECTION_SIZE_BITS; if ((string = pc->read_vmcoreinfo("NUMBER(SECTION_SIZE_BITS)"))) { machdep->section_size_bits = atol(string); diff --git a/defs.h b/defs.h index 971005596506..a2f30853a4b1 100644 --- a/defs.h +++ b/defs.h @@ -3261,7 +3261,9 @@ typedef signed int s32; #define ARM64_STACK_SIZE (16384) #define ARM64_IRQ_STACK_SIZE ARM64_STACK_SIZE -#define _SECTION_SIZE_BITS 30 +#define _SECTION_SIZE_BITS 30 +#define _SECTION_SIZE_BITS_5_12 27 +#define _SECTION_SIZE_BITS_5_12_64K 29 #define _MAX_PHYSMEM_BITS 40 #define _MAX_PHYSMEM_BITS_3_17 48 #define _MAX_PHYSMEM_BITS_52 52 -- 2.27.0